<!DOCTYPE html>
<html lang="zh">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Document</title>
	<style>
		.box{
			width: 200px;
			height: 200px;
			border: 2px solid #000;
			margin:100px auto;
			border-radius: 50%;
			/* box-shadow: x y 阴影的模糊半径 扩展的半径 阴影颜色 阴影的位置; */
			box-shadow: 10px 10px 10px 10px pink inset;
		}
	</style>
</head>
<body>
	<div class="box"></div>
</body>
</html>